What could possibly replace artificial intelligence?
By definition, artificial intelligence includes all forms of computer systems capable of completing tasks that would ordinarily warrant human intelligence.

A superintelligent AI would have intelligence far superior to that of any human and therefore would be capable of creating systems beyond our capabilities.

As a consequence, if a technology superior to AI were to be created, it would almost certainly be created by an artificial intelligence.


  For the purposes of mankind, however, superintelligent artificial intelligence is the ultimate technology due to the fact that it will be able to surpass humans in every field, and, if anything, replace the need for human intelligence.


In our past experience, intelligence has been the most valuable trait for any entity to manifest - for this reason, in an anthropomorphic context, we can predict that artificial intelligence will be the ultimate achievement.


  The main reason why we will certainly not be able to replace superintelligent AI is that it will surpass us in every respect - if there is ever any replacement, it will be created by the AI similarly to the way we may create an AI that replaces us.